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SubjectRe: [PATCH v3 0/3] pstore: add pstore unregister
On Tue, Oct 20, 2015 at 10:19:09AM -0700, Kees Cook wrote:
> On Tue, Oct 20, 2015 at 12:39 AM, Geliang Tang <geliangtang@163.com> wrote:
> > On Mon, Oct 19, 2015 at 10:56:54PM +0000, Luck, Tony wrote:
> >> Thanks for looking to close out this TODO item.
> >>
> >> The thing that scared me about unloading pstore was what happens to
> >> a process that is in the middle of reading some /sys/fs/pstore/file-name-here
>
> Were you able to verify that this reading-while-rmmod case works correctly?
>
> -Kees

$ sudo insmod zlib_deflate.ko
$ sudo insmod pstore.ko
$ lsmod
Module Size Used by
pstore 11225 0
zlib_deflate 18292 1 pstore

$ sudo mount -t pstore pstore /sys/fs/pstore
$ lsmod
Module Size Used by
pstore 11225 1
zlib_deflate 18292 1 pstore

$ sudo insmod reed_solomon.ko
$ sudo insmod ramoops.ko mem_address=0x40000000 mem_size=0x400000
$ lsmod
Module Size Used by
ramoops 9638 0
reed_solomon 5150 1 ramoops
pstore 11225 2 ramoops
zlib_deflate 18292 1 pstore

$ tail -f /sys/fs/pstore/console-ramoops-0 &
[1] 3483
$ lsmod
Module Size Used by
ramoops 9638 0
reed_solomon 5150 1 ramoops
pstore 11225 3 ramoops
zlib_deflate 18292 1 pstore

$ kill -9 3483
$ lsmod
Module Size Used by
ramoops 9638 0
reed_solomon 5150 1 ramoops
pstore 11225 2 ramoops
zlib_deflate 18292 1 pstore

$ sudo rmmod ramoops
$ lsmod
Module Size Used by
reed_solomon 5150 0
pstore 11225 1
zlib_deflate 18292 1 pstore

$ sudo umount /sys/fs/pstore/
$ lsmod
Module Size Used by
reed_solomon 5150 0
pstore 11225 0
zlib_deflate 18292 1 pstore

$ sudo rmmod pstore
$ lsmod
Module Size Used by
reed_solomon 5150 0
zlib_deflate 18292 0

Thanks.
Geliang Tang



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